  <form action="<?php echo $PHP_SELF; ?>" method="POST">

   <br/>
    <?php
     foreach ($c->inventoryItems as $item)
     {
       ?><br/><a href="?page=inventory&action=load&id=<?php echo $item->id; ?>"><?php echo $item->title ?></a><?php
     }
    ?><br/>

    <?php
     foreach ($c->sales as $sale)
     {
       ?><br/><a href="?page=sale&action=load&id=<?php echo $sale->id; ?>"><?php echo $sale->title ?></a><?php
     }
    ?><br/>
  </form>